/*
Copyright 2022 The OpenFunction Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main

import (
	"flag"
	"fmt"
	"os"
	"os/signal"
	"syscall"
	"time"

	componentsv1alpha1 "github.com/dapr/dapr/pkg/apis/components/v1alpha1"
	httpv1alpha1 "github.com/kedacore/http-add-on/operator/apis/http/v1alpha1"
	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
	shipwrightv1alpha1 "github.com/shipwright-io/build/pkg/apis/build/v1alpha1"
	"go.uber.org/zap/zapcore"
	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	"k8s.io/client-go/discovery"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	typedeventsv1 "k8s.io/client-go/kubernetes/typed/events/v1"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	"k8s.io/client-go/tools/events"
	knserving "knative.dev/serving/pkg/client/clientset/versioned/scheme"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	k8sgatewayapiv1alpha2 "sigs.k8s.io/gateway-api/apis/v1alpha2"

	corev1beta1 "github.com/openfunction/apis/core/v1beta1"
	corev1beta2 "github.com/openfunction/apis/core/v1beta2"
	openfunctionevent "github.com/openfunction/apis/events/v1alpha1"
	networkingv1alpha1 "github.com/openfunction/apis/networking/v1alpha1"
	"github.com/openfunction/controllers/core"
	eventcontrollers "github.com/openfunction/controllers/events"
	networkingcontrollers "github.com/openfunction/controllers/networking"
	"github.com/openfunction/pkg/core/builder"
	"github.com/openfunction/pkg/core/serving"
	//+kubebuilder:scaffold:imports
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func init() {
	_ = clientgoscheme.AddToScheme(scheme)
	_ = knserving.AddToScheme(scheme)
	_ = componentsv1alpha1.AddToScheme(scheme)
	_ = kedav1alpha1.AddToScheme(scheme)
	_ = httpv1alpha1.AddToScheme(scheme)
	_ = openfunctionevent.AddToScheme(scheme)
	_ = k8sgatewayapiv1alpha2.AddToScheme(scheme)
	_ = networkingv1alpha1.AddToScheme(scheme)
	_ = shipwrightv1alpha1.AddToScheme(scheme)
	utilruntime.Must(corev1beta1.AddToScheme(scheme))
	utilruntime.Must(corev1beta2.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	var probeAddr string
	var interval time.Duration

	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.DurationVar(&interval, "builder-check-interval", time.Minute, "The interval used to check the expired builder")

	// Use `--zap-log-level=debug` to enable debug log.
	opts := zap.Options{
		Development:     true,
		StacktraceLevel: zapcore.PanicLevel,
		TimeEncoder:     zapcore.RFC3339TimeEncoder,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		MetricsBindAddress:     metricsAddr,
		Port:                   9443,
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "79f0111e.openfunction.io",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	eventsV1Client, err := typedeventsv1.NewForConfig(ctrl.GetConfigOrDie())
	if err != nil {
		setupLog.Error(err, "unable to get events client")
		os.Exit(1)
	}
	eventBroadcaster := events.NewBroadcaster(&events.EventSinkImpl{Interface: eventsV1Client})
	termCh := make(chan os.Signal, 1)
	signal.Notify(termCh, os.Interrupt, syscall.SIGTERM)
	stopCh := make(chan struct{}, 1)
	go func() {
		for {
			select {
			case <-termCh:
				stopCh <- struct{}{}
				return
			}
		}
	}()
	eventBroadcaster.StartRecordingToSink(stopCh)
	eventRecorder := eventBroadcaster.NewRecorder(mgr.GetScheme(), "openfunction")

	// Check if HPA v2 is supported in the cluster
	if dc, err := discovery.NewDiscoveryClientForConfig(mgr.GetConfig()); err == nil {
		hpagv := "autoscaling/v2"
		if _, err := dc.ServerResourcesForGroupVersion(hpagv); err != nil {
			setupLog.Error(err, fmt.Sprintf("HPA v2 (%s) is not supported in the cluster", hpagv))
			os.Exit(1)
		}
	} else {
		setupLog.Error(err, "unable to create discovery client")
		os.Exit(1)
	}

	if err = core.NewFunctionReconciler(mgr, interval, eventRecorder).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create function controller")
		os.Exit(1)
	}
	if err = core.NewBuilderReconciler(mgr, eventRecorder).SetupWithManager(mgr, builder.Registry(mgr)); err != nil {
		setupLog.Error(err, "unable to create builder controller")
		os.Exit(1)
	}
	if err = core.NewServingReconciler(mgr, eventRecorder).SetupWithManager(mgr, serving.Registry(mgr)); err != nil {
		setupLog.Error(err, "unable to create serving controller")
		os.Exit(1)
	}

	if err = (&eventcontrollers.EventSourceReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("EventSource"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "EventSource")
		os.Exit(1)
	}
	if err = (&eventcontrollers.TriggerReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Trigger"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Trigger")
		os.Exit(1)
	}
	if err = (&networkingcontrollers.GatewayReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("Gateway"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Gateway")
		os.Exit(1)
	}

	if os.Getenv("ENABLE_WEBHOOKS") != "false" {
		if err = (&corev1beta2.Builder{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Builder")
			os.Exit(1)
		}
		if err = (&corev1beta2.Function{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Function")
			os.Exit(1)
		}
		if err = (&corev1beta2.Serving{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Serving")
			os.Exit(1)
		}
		if err = (&networkingv1alpha1.Gateway{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "Gateway")
			os.Exit(1)
		}
	}
	//+kubebuilder:scaffold:builder

	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

	setupLog.Info("starting manager")
	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}
